#sim #time

archived app llhd-sim

Deprecated reference simulator for Low Level Hardware Description assembly. Now part of the LLHD crate.

5 releases (3 breaking)

0.4.0 Aug 26, 2020
0.3.1 Mar 17, 2019
0.3.0 Mar 12, 2019
0.2.0 Jan 13, 2019
0.1.0 Jan 5, 2019

Apache-2.0 OR MIT

2.5K SLoC


Moved: llhd-sim is now part of the llhd repository and crate. This repository will no longer be updated.

Build Status Crates.io

This is the reference simulator for llhd, striving to be complete but as minimal as possible. Its goal is to serve as a starting point for developing more sophisticated simulators for hardware written in llhd. As a secondary goal it acts as an application example of llhd.



You need a working Rust installation. Use cargo to install llhd-sim:

cargo install llhd-sim


Given the following input file:

// foo.llhd
proc @foo () (i32$ %out) {
    drv %out 0 1ns
    drv %out 42 2ns
    %0 = add i32 9000 1
    drv %out %0 3ns

Use llhd-sim to simulate the described hardware and produce a VCD file:

llhd-sim foo.llhd
gtkwave /tmp/output.vcd


~188K SLoC